Backpack



FIG. 1 is a perspective view of a backpack showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being amirror image except for the slide fastener pulls; and,

FIG. 5 is a rear elevational view thereof.

The broken lines shown throughout the views are intended to representstitching.

I claim the ornamental design for a backpack, as shown and described.